I love typing in www.google.con or yelp.lom to be told that the address cannot be found. I freak out, tell Firefox it's an idiot, and then head to downforeveryoneorjustme.con, at which point I develop an ulcer until I realize that it was just my butterfingers making me enter typos into the address bar.
URL Fixer is like my Zen-master — it keeps me calm by fixing my misspelled urls. After you tell it to confirm confirmations, you'll get a pop up asking you if you meant their suggestion (which appear to be pretty accurate so far!). Butterfingers, you've met your match.